Product
Vivo Z3i
Vivo Z3i
Xiaomi Mi 8 SE
Xiaomi Mi 8 SE
Battery
Charging 18W wired 18W wired, QC3
Type 3315 mAh, non-removable Li-Po 3120 mAh, non-removable
Body
Build - Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
Dimensions 156 x 75.6 x 8.1 mm (6.14 x 2.98 x 0.32 in) 147.3 x 73.1 x 7.5 mm (5.80 x 2.88 x 0.30 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 164 g (5.78 oz) 164 g (5.78 oz)
Comms
Bluetooth 4.2, A2DP, EDR, LE, aptX 5.0, A2DP, LE
Infrared port - Yes
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS, BDS, GALILEO
Radio FM radio No
USB microUSB 2.0, OTG USB Type-C
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 5
Resolution 1080 x 2280 pixels, 19:9 ratio (~400 ppi density) 1080 x 2244 pixels, 18.7:9 ratio (~423 ppi density)
Size 6.3 inches, 99.1 cm2 (~84.0% screen-to-body ratio) 5.88 inches, 87.6 cm2 (~81.3% screen-to-body ratio)
Type IPS LCD Super AMOLED, HDR10
Features
Sensors Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2018, October. Released 2018, October 2018, May. Released 2018, June
Status Discontinued Discontinued
Main Camera
Dual 16 MP, f/2.0, PDAF 2 MP, f/2.4, (depth) 12 MP, f/1.9, 1/2.55", 1.4µm, dual pixel PDAF 5 MP, f/2.0, (depth)
Features LED flash, HDR, panorama LED flash, HDR, panorama
Video 1080p@30fps 4K@30fps, 1080p@30/120fps
Memory
Card slot microSDXC (dedicated slot) No
Internal 128GB 6GB RAM 64GB 4GB RAM, 64GB 6GB RAM, 128GB 6GB RAM
  eMMC 5.1 -
Misc
Colors Aurora blue, Millenium Pink Gray, Blue, Red, Gold
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 3, 5, 8, 34, 38, 39, 40, 41 1, 3, 5, 7, 8, 34, 38, 39, 40, 41
Speed HSPA, LTE HSPA 42.2/5.76 Mbps, LTE Cat15 800/150 Mbps
Technology GSM / CDMA / HSPA / LTE GSM / CDMA / HSPA / LTE
  CDMA 800 / 1900 & TD-SCDMA CDMA 800 & TD-SCDMA
Our Tests
Audio quality - Noise -96.0dB / Crosstalk -95.9dB
Battery (old) - Endurance rating 86h
Camera - Photo / Video
Display - Contrast ratio: Infinite (nominal), 3.901 (sunlight)
Loudspeaker - Voice 70dB / Noise 74dB / Ring 85dB
Performance - AnTuTu: 169044 (v7) GeekBench: 5912 (v4.4) GFXBench: 12fps (ES 3.1 onscreen)
Platform
Chipset Mediatek MT6771 Helio P60 (12 nm) Qualcomm SDM710 Snapdragon 710 (10 nm)
CPU Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) Octa-core (2x2.2 GHz 360 Gold & 6x1.7 GHz Kryo 360 Silver)
GPU Mali-G72 MP3 Adreno 616
OS Android 8.1 (Oreo) Android 8.1 (Oreo), MIUI 9.5
Selfie camera
Features HDR -
Single 24 MP, f/2.0, 26mm (wide), 1/2.8", 0.9µm 20 MP, f/2.0, (wide), 1/3", 0.9µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes No
Loudspeaker Yes Yes